Samsung
Turn Vibrate When Call Ends On or Off auf Samsung
The short buzz you feel right after a call disconnects comes from a dedicated call alert, separate from your ringtone vibration or the phone's general vibration mode.
Samsung ties this signal to the call alerts and ringtone settings inside the Phone app, not to the system-wide sound profile. That is why switching to silent mode does not always stop it from firing.
To change it, follow this path: Phone ➔ Menu ➔ Settings ➔ Call alerts and ringtone ➔ enable or disable Vibrate when call ends.
Turning it on gives a short haptic confirmation that the line dropped, useful if you keep the phone in a pocket or away from your ear during a call. Turning it off removes that extra pulse, which helps if you find it distracting during back-to-back calls or in quiet settings.
If your phone still vibrates after disabling this option, check whether a messaging or VoIP app is sending its own call ended notification. Those alerts run independently of the native Phone app setting and need to be adjusted inside that app instead.